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San Tan Valley, AZ Weather. The average temperature of San Tan Valley is 71.43Â°F, which is much higher than the Arizona average temperature of 65.97Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #76.
On average, there are 265 sunny days per year in San Mateo, California. The July high is around 74 degrees. The January low is 43. Sperling's comfort index for San Mateo is a 84 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54.